docs: Use <Hn> as Heading elements instead of <DIV class="doc_foo">.

H1 ... doc_title
H2 ... doc_section
H3 ... doc_subsection
H4 ... doc_subsubsection

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129736 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/HowToSubmitABug.html b/docs/HowToSubmitABug.html
index b9d8362..ca34384 100644
--- a/docs/HowToSubmitABug.html
+++ b/docs/HowToSubmitABug.html
@@ -7,9 +7,9 @@
 </head>
 <body>
 
-<div class="doc_title">
+<h1>
   How to submit an LLVM bug report
-</div>
+</h1>
 
 <table class="layout" style="width: 90%" >
 <tr class="layout">
@@ -37,9 +37,9 @@
 </table>
 
 <!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
   <a name="introduction">Introduction - Got bugs?</a>
-</div>
+</h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -76,9 +76,9 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
   <a name="crashers">Crashing Bugs</a>
-</div>
+</h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -112,9 +112,9 @@
 </div>
 
 <!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
   <a name="front-end">Front-end bugs</a>
-</div>
+</h3>
 
 <div class="doc_text">
 
@@ -137,9 +137,9 @@
 </div>
 
 <!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
   <a name="ct_optimizer">Compile-time optimization bugs</a>
-</div>
+</h3>
 
 <div class="doc_text">
 
@@ -171,9 +171,9 @@
 </div>
 
 <!-- ======================================================================= -->
-<div class="doc_subsection">
+<h3>
   <a name="ct_codegen">Code generator bugs</a>
-</div>
+</h3>
 
 <div class="doc_text">
 
@@ -208,9 +208,9 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
   <a name="miscompilations">Miscompilations</a>
-</div>
+</h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">
@@ -241,9 +241,9 @@
 </div>
 
 <!-- *********************************************************************** -->
-<div class="doc_section">
+<h2>
   <a name="codegen">Incorrect code generation</a>
-</div>
+</h2>
 <!-- *********************************************************************** -->
 
 <div class="doc_text">